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Publikation

Costa, C.T.; Strieder, M.L.; Abel, S.; Delatorre, C.A. Phosphorus and nitrogen interaction: loss of QC identity in response to P or N limitation is anticipated in the <i>pdr23</i> mutant Braz J Plant Physiol 23(3), 219-229, (2011)

Changes in root architecture are an important adaptive strategy used by plants in response to limited nutrient availability to increase the odds of acquiring them. The quiescent center (QC) plays an important role by altering the meristem activity causing differentiation and therefore, inducing a determinate growth program. The arabidopsis mutant pdr23 presents primary short root in the presence of nitrate and is inefficient in the use of nucleic acids as a source of phosphorus. In this study the effect of the pdr23 mutation on the QC maintenance under low phosphorus (P) and/or nitrogen is evaluated. QC identity is maintained in wild-type in the absence of nitrate and/or phosphate if nucleic acids can be used as an alternative source of these nutrients, but not in pdr23. The mutant is not able to use nucleic acids efficiently for substitute Pi, determinate growth is observed, similar to wild-type in the total absence of P. In the absence of N pdr23 loses the expression of QC identity marker earlier than wild-type, indicating that not only the response to P is altered, but also to N. The data suggest that the mutation affects a gene involved either in the crosstalk between these nutrients or in a pathway shared by both nutrients limitation response. Moreover loss of QC identity is also observed in wild-type in the absence of N at longer limitation. Less drastic symptoms are observed in lateral roots of both genotypes.
Bücher und Buchkapitel

Vaira, A.M.; Gago-Zachert, S.; Garcia, M.L.; Guerri, J.; Hammond, J.; Milne, R.G.; Moreno, P.; Morikawa, T.; Natsuaki, T.; Navarro, J.A.; Pallas, V.; Torok, V.; Verbeek, M.; Vetten, H.J. Family Ophioviridae (King, A. M. Q., Adams, M. J., Carstens, E. B., Lefkowitz, E. J.). Elsevier, Academic Press 743-748, (2011) ISBN: 978-0-12-384684-6

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Publikation

Ludwig-Müller, J.; Denk, K.; Cohen, J.D.; Quint, M. An inhibitor of tryptophan-dependent biosynthesis of indole-3-acetic acid alters seedling development in <span>Arabidopsis</span> J Plant Growth Regul 29, 242-248, (2010)

Although polar transport and the TIR1-dependent signaling pathway of the plant hormone auxin/indole-3-acetic acid (IAA) are well characterized, understanding of the biosynthetic pathway(s) leading to the production of IAA is still limited. Genetic dissection of IAA biosynthetic pathways has been complicated by the metabolic redundancy caused by the apparent existence of several parallel biosynthetic routes leading to IAA production. Valuable complementary tools for genetic as well as biochemical analysis of auxin biosynthesis would be molecular inhibitors capable of acting in vivo on specific or general components of the pathway(s), which unfortunately have been lacking. Several indole derivatives have been previously identified to inhibit tryptophan-dependent IAA biosynthesis in an in vitro system from maize endosperm. We examined the effect of one of them, 6-fluoroindole, on seedling development of Arabidopsis thaliana and tested its ability to inhibit IAA biosynthesis in feeding experiments in vivo. We demonstrated a correlation of severe developmental defects or growth retardation caused by 6-fluoroindole with significant downregulation of de novo synthesized IAA levels, derived from the stable isotope-labeled tryptophan pool, upon treatment. Hence, 6-fluoroindole shows important features of an inhibitor of tryptophan-dependent IAA biosynthesis both in vitro and in vivo and thus may find use as a promising molecular tool for the identification of novel components of the auxin biosynthetic pathway(s).
Publikation

Schilling, S.; Stenzel, I.; von Bohlen, A.; Wermann, M.; Schulz, K.; Demuth, H.-U.; Wasternack, C. Isolation and characterization of the glutaminyl cyclases from <i>Solanum tuberosum</i> and <i>Arabidopsis thaliana</i>: implications for physiological functions Biol. Chem 388, 145-153, (2007)

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Bücher und Buchkapitel

Vaira, A.M.; Acotto, G.P.; Gago-Zachert, S.; García, M.L.; Grau, O.; Milne, R.G.; Morikawa, T.; Natsuaki, T.; Torov, V.; Verbeek, M.; Vetten, H.J. Genus Ophiovirus (Fauquet, C. M., Mayo, M. A., Maniloff, J., Desselberger, U., Ball, L. A.). Elsevier, Academic Press 673-679, (2005) ISBN: 9780080575483; 9780122499517

Virus Taxonomy is a standard and comprehensive source for the classification of viruses, created by the International Committee of the Taxonomy of Viruses. The book includes eight taxonomic reports of the ICTV and provides comprehensive information on 3 taxonomic orders of viruses, 73 families, 9 subfamilies, 287 genera, and 1938 virus species. The book also features about 429 colored pictures and diagrams for more efficient learning. The text is divided into four parts, comprised of 16 chapters and presenting the following features: • Compiled data from numerous international experts about virus taxonomy and nomenclature • Organized information on over 6000 recognized viruses, illustrated with diagrams of genome organization and virus replication cycle • Data on the phylogenetic relationships among viruses of the same and different taxa • Discussion of the qualitative and quantitative relationships of virus sequences The book is a definitive reference for microbiologists, molecular biologists, research-level virologists, infectious disease specialists, and pharmaceutical researchers working on antiviral agents. Students and novices in taxonomy and nomenclature will also find this text useful. 
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